 |
1. Resin
1) Unsaturated Polyester Resin
| Good Point |
Short cure time, high production |
| chief price |
| good chemical resistance |
| a variety of formation |
| free coloring |
| Kind |
General Resin |
Orthophthalic Acid |
| Medium Corrosion Resistance Resin |
Isophthalic Acid |
High Corrosion Resistance Resin
|
Bisphenol
Vinyl Ester
Novolac |
2)Epoxy Resin
3)Vinyl Ester Resin(Epoxy Acrylate)
|
2. Catalyst & Accelerator
Chemicals to assist hardening of resin. Use as to kinds of resin |
[ Catalyst ]
Name
|
Characteristic |
M. E. K. Po.
(Methyl Ethyl
Ketone Peroxide) |
use with Cobalt Octoate
cure at normal
temperature |
B. P. O.
(Benzoyl Peroxide) |
cure at added
temperature
80℃ ~ 130℃ |
|
[ Accelerator ]
Name
|
Characteristic |
| Cobalt Octoate |
Use with MEKPO
cure at normal
temperature |
D. M. A.
|
Common usage |
|
3. Gel Coat
A FRP formation method that mold surface is made of only resin first and then fiberglass is laminated contributes a beautiful finishing and a low temperature variation. This resin layer is called 'Gel coat'.
'Colored gel coat' leads no painting and neat finishings, so it's used generally.
But gel coat layer does hardly have strength. Too thin FRP product under 1mm thickness like RC helicopter's body has high weight ratio of gel coat, so a light and strong body rarely ever use gel coat to less weight. When glassfiber is laminated directly on mold without gel coat, bubble is created easily on surface. Also painting may be hard because of fiberglass's shreds by sanding.
4. Reinforcement(Fiberglass)
Fiberglass is usually used as reinforcement. For better absorption of resin,
the surface of fiber is pretreated. The fiberglass is selected as to the
use of products
|
|
Glass |
Weight/㎡ (g)
|
|
Weight Kg
|
Width cm
|
Length m |
| Chopped Strand Mat |
300 |
30 |
104 |
96 |
| 380 |
30 |
104 |
76 |
| 450 |
30 |
104 |
64 |
| 600 |
30 |
104 |
48 |
| Roving Cloth |
570 |
29 ~ 30 |
100 |
50 |
| 860 |
43 ~ 44 |
100 |
50 |
| Yarn Cloth |
230 |
23 |
100 |
100 |
| Surface Mat |
30 |
9 |
104 |
300 |
|
